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  Subjects -> CHEMISTRY (Total: 792 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (552 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (24 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (42 journals)
    - PHYSICAL CHEMISTRY (64 journals)

ANALYTICAL CHEMISTRY (47 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 229)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 9)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 20)
American Journal of Analytical Chemistry     Open Access   (Followers: 27)
Analytica Chimica Acta     Hybrid Journal   (Followers: 33)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 27)
Analytical Chemistry     Full-text available via subscription   (Followers: 332)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 25)
Current Analytical Chemistry     Hybrid Journal   (Followers: 6)
Drug Testing and Analysis     Hybrid Journal   (Followers: 4)
Electroanalysis     Hybrid Journal   (Followers: 4)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 6)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 20)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 4)
ISRN Analytical Chemistry     Open Access   (Followers: 16)
ISRN Chromatography     Open Access   (Followers: 2)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 5)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 8)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 15)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 3)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 18)
Main Group Metal Chemistry     Full-text available via subscription   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Phytochemical Analysis     Hybrid Journal   (Followers: 1)
Polish Journal of Chemical Technology     Open Access   (Followers: 2)
Reviews in Analytical Chemistry     Full-text available via subscription   (Followers: 8)
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 7)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 21)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 1)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
World Journal of Analytical Chemistry     Open Access  
Journal Cover Journal of Analytical Chemistry
   [17 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
     Published by Springer-Verlag Homepage  [2210 journals]   [SJR: 0.322]   [H-I: 17]
  • The use of thermal desorption in the speciation analysis of mercury in
           soil, sediments and tailings
    • Abstract: Abstract The thermal desorption of mercury from the solid phase coupled with atomic absorption spectroscopy (AAS) is useful and simple method of mercury speciation analysis of the environmental samples. The present work is focused on the mercury desorption use for soil, sediments and tailings study. The extensive experimental material of many authors was summarized in this work with regard to a critical confrontation of approaches used in data interpretation. The main emphasis was put on the most frequently observed forms as Hg0, Hg2+ bound to mineral or organic surfaces, Hg2+ bound to the most common ligands and HgS. A comprehensive conception of the usage possibilities of this method as suitable analytical tool for speciation analysis was the main aim. This work includes not only the preparation of calibration materials and the description of their desorption behaviour but also summarizes the interpretations of mercury release curves of real samples and becomes an effective tool for their evaluation.
      PubDate: 2014-12-01
       
  • Inertness criterion for gas-chromatographic systems
    • Abstract: Abstract For evaluating the inertness of gas-chromatographic systems with respect to the polar components of test samples as the most important parameter of these samples, it was proposed to decrease the number of test mixture components to two but to perform the analysis of their solutions of different concentrations in contrast to previously known recommendations. Statistically significant differences in the relative chromatographic peak areas of polar and nonpolar components are a criterion for insufficient inertness. The analyte amount (expressed as the mass index pm = −log m) in the sample of a mixed solution with an inert component (n-alkane) at which differences in the relative peak areas become higher than the sums of the standard deviations of the relative areas, as compared with more concentrated solutions at the same ratios between the components, can be considered the inertness limit of a chromatographic system with respect to the characterized compound.
      PubDate: 2014-12-01
       
  • Application of tartrazine for sensitive and selective kinetic
           determination of Cu(II) traces
    • Abstract: Abstract An efficient, highly sensitive, fast and selective kinetic method for determination of traces of Cu(II) was developed and applied for its quantification in different real samples. The method was based on the catalytic effect of Cu(II) traces on the redox reaction of artificial azo-dye tartrazine (tri-sodium-5-hydroxy-1-(4-sulfophenyl)-4-[(4-sulfophenyl)azo]pyrazole-3-carboxylate) with H2O2. The optimum operating conditions regarding reagent concentration were examined and established. Linearity of the method was obtained in the concentration range from 13 to 318 ng/mL of Cu(II), with a detection limit (LOD) (3s b/m) of 2 ng/mL, and limit of quantification (LOQ) (10s b/m) of 7 ng/mL. Obtained results for Cu(II) determination in analyzed samples, as well as the development and validation of the proposed analytical procedure are given and discussed.
      PubDate: 2014-12-01
       
  • Reversed phase chromatographic separation and isolation of tautomers of
           naphthoquinoneoximes by HPLC. Effect of ph of mobile phase on separation
           of 3-chloro-2-hydroxy-4-naphthoquinone-1-oxime
    • Abstract: Abstract Reversed phase HPLC separation and isolation of isomers of 3-chloro-2-hydroxy-4-naphthoquinone-1-oxime was investigated. At pH 7 with acetonitrile as a mobile phase, no separation occurs. Using various buffer solutions the pH of the mobile phase was maintained and the effect was studied between pH ∼ 2.5 and ∼10.5. Two distinct peaks are observed in chromatograms in the pH range studied. These peaks are assigned to para-tautomer 3,3-chloro-2-hydroxy-4-naphthoquinone-1-oxime and ortho-tautomer 4,3-chloro-4-hydroxy-2-naphthoquinone-1-oxime. Tautomeric equilibrium was found in acidic pH of mobile phase, whereas at pH 6.8 and basic pH of mobile phase the tautomers are well separated from each other. Isolation of the tautomers was carried out by preparative HPLC technique. The solids of tautomers 3 and 4 were obtained as ammonium acetate adducts.
      PubDate: 2014-12-01
       
  • Simultaneous cyclic-injection spectrophotometric determination of aluminum
           and iron in petroleum products
    • Abstract: Abstract A procedure is developed for the cyclic-injection spectrophotometric determination of iron and aluminum in petroleum products; it includes microwave sample mineralization followed by the determination of analytes as their complexes with Chrome Azurol S at pH 5. The classical least-squares technique is used for the simultaneous determination of iron and aluminum. The analytical range for elements covers from 10 to 100 mg/kg at a sample weight of 1 g. The limits of detection for both elements are 3 mg/kg. The developed procedure was used for the determination of iron and aluminum in the spent engine oil and marine fuel.
      PubDate: 2014-12-01
       
  • Ionic liquid for homogeneous liquid-liquid microextraction
           
    • Abstract: Abstract A novel homogeneous liquid-liquid microextraction technique based on use of ionic liquids (ILs), termed in situ solvent formation microextraction (ISFME) is developed for separation/preconcentration of Co(II) ions. In this method, small amount of sodium hexafluorophosphate (NaPF6, as an ion-pairing agent) was added to the sample solution containing very small amount of 1-hexyl-3-methylimidazolium tetrafluoroborate ([Hmim][BF4], as hydrophilic IL). A cloudy solution was formed as a result of formation of fine droplets of 1-hexyl-3-methylimidazolium hexafluorophosphate [Hmim][PF6]. After centrifuging, the fine droplets of the extractant phase settled to the bottom of the conical-bottom glass centrifuge tube. ISFME is a simple and rapid method for extraction and preconcentration of cobalt ions from water samples that can be applied for the sample solutions containing very high concentrations of salt. Furthermore, this technique is much safer in comparison with the organic solvent extraction. Reliability of the introduced methodology was evaluated by analyzing water reference material. ISFME was successfully applied to determining cobalt(II) in real water samples. Schiff base ligand, 3,3′-(1E,1E′)-(propane-1,2-diylbis(azan-1-yl-1-ylidene)bis(methan-1-yl-1-ylidene)bis(4-bromophenol) (L) was chosen as a complexing agent. Analysis was carried out using atomic absorption spectrometry. Type and amount of IL, pH and the other parameters were optimized. Under the optimum conditions, the limit of detection (LOD) was 0.06 ng/mL and the relative standard deviation (RSD) was 1.8% for 10 ng/mL cobalt.
      PubDate: 2014-12-01
       
  • Development and validation of HPLC method for the resolution of
           derivatives of 1-bromo-3-chloro-2-propanol: a novel chiral building block
           for the synthesis of pharmaceutically important compounds
    • Abstract: Abstract The methods for the separation of racemic compounds [(RS)-1-bromo-3-chloro-2-propanol, (RS)-1-bromo-3-chloropropan-2-yl acetate] into the corresponding enantiomers were tried to develop in high performance liquid chromatography in a single injection mode. In the case of HPLC, both the reversed (Phenomenex Lux 5u cellulose-1, Lux 5u cellulose-2, Lux 5u amylose-1) and normal phase (Chiralcel OJH, ODH, ADH) chiral columns were used for this purpose. HPLC methods could not resolute the desired enantiomers. However, phenoxy derivatives of (RS)-1-bromo-3-chloro-2-propanol and (RS)-1-bromo-3-chloro- propan-2-yl acetate were separated by normal phase (ODH) column using a mobile phase consisting of n-hexane and isopropanol (80: 20) at a flow rate of 0.5 mL/min (25°C) and detected at 254 nm. The method was validated for linearity, range, accuracy and precision. The developed method was applied for monitoring the progress of lipase catalyzed enantioselective synthesis of (S)-1-bromo-3-chloropropan-2-yl acetate from (RS)-1-bromo-3-chloro-2-propanol. All the analytes were synthesized chemically.
      PubDate: 2014-12-01
       
  • Reversed-phase liquid chromatography of some flavonoids in aqueous-organic
           and modified micellar mobile phases
    • Abstract: Abstract The retention and separation of flavonoids quercetin, rutin, hyperoside, and flaronin in aqueous-alcoholic and aqueous-micellar mobile phases containing sodium dodecyl sulfate and modified with propanol-2 is studied by reversed-phase high-performance and thin-layer liquid chromatography on varying the concentration of surfactants and the nature and concentration of modifiers of micellar mobile phases (organic solvent and a strong electrolyte). The optimal chromatographic systems are found. The method was used to determine quercetin and rutin in herbal and pharmaceutical preparations.
      PubDate: 2014-12-01
       
  • Chromatographic methods for the determination of fluphenazine,
           nortriptyline and its impurity amitriptyline in bulk and pharmaceutical
           formulations
    • Abstract: Abstract Two selective, reproducible methods were proposed for the simultaneous determination of Fluphenazine hydrochloride (Flu) and Nortriptyline hydrochloride (Nor) in the presence of its impurity Amitriptyline hydrochloride (Ami). The first method is TLC-densitometric on silica gel with ethyl acetate-methanol-concentrated ammonia 2: 7: 0.2 (v/v/v) as mobile phase. The linear range 0.5–20, 0.5–5 and 0.5–5 μg per spot for Nor, Ami and Flu respectively. The second method is HPLC on Genesis C18 column with 0.1 M ammonium acetate-acetonitrile 1: 1 (v/v) as mobile phase and Ultraviolet detection at 254 nm. The LC method was linear over concentration ranges 100–500, 50–300 and 10–250 μg/mL for Nor, Ami and Flu respectively. The proposed methods were successfully applied for determination of these drugs in laboratory prepared mixtures, and in pharmaceutical dosage forms showing good accuracy and precision. The results obtained agreed statistically with those obtained by using the official methods.
      PubDate: 2014-12-01
       
  • Eco-friendly, cost-effective and fast method for the estimation of
           furosemide and amiloride in tablet formulation by sequential injection
           chromatography
    • Abstract: Abstract Sequential injection chromatography (SIC) is based on a stopped-flow approach utilizing microscale low-pressure pump and selection valves coupled with micro-scale fiber optic spectrometric devices. In the current communication, a new method for the estimation of furosemide (FSD) and amiloride (AMD) in tablet formulation exploiting SIC is reported. The method was reverse-phase liquid chromatographic-based. The separation was carried out onto C18 monolithic column (4.6 × 50 mm) with a mobile phase composition of 25 mM phosphate buffer (pH 4.0)-acetonitrile (65: 35, v/v). Other conditions were: sample volume 30 μL, flow rate 30 μL/s and UV detection at 283 nm. The SIC method is eco-friendly and cost-effective. The volume of consumed mobile phase was 3.25 mL. The sample frequency was 24 samples/h. The assay also exhibited linear dynamic ranges of 10–100 μg/mL for FSD and 5–80 μg/mL for AMD. Acceptable intra- and inter-day precision (the RSD values were less than 2.2%) as well as accuracy (the recovery range was 97.5–98.4%) were obtained for concentrations over the range of the standard curves. The procedure was established for the purpose of quality control at a pharmaceutical laboratory.
      PubDate: 2014-12-01
       
  • Evaluation of the antioxidant capacity of cognacs and brandies by
           differential pulse voltammetry
    • Abstract: Abstract Components of cognacs and brandies form anodic peaks at 0.44 and 0.59 V in the differential pulse voltammogram recorded on a glassy carbon electrode modified with multiwalled carbon nanotubes in phosphate buffer solution at pH 3.0. The effect of the pH of the supporting electrolyte and pulse parameters on the analytical signal is evaluated. It was found that the peak at 0.44 V is integral in nature; gallic acid contributes to this peak. The peak at 0.59 V is a result of the oxidation of ellagic acid. We developed a method for the evaluation of the antioxidant capacity (AOC) of cognacs and brandies by differential pulse voltammetry and tested it on nine samples. The total area of two oxidation steps was selected as a parameter characterizing the antioxidant properties. Antioxidant capacity was expressed in equivalents of ellagic acid per 100 mL of a beverage. Correlations between the AOC of beverages and their total AOC and ferric reducing power (r = 0.9752 and 0.9539 at P = 0.95, respectively) are found.
      PubDate: 2014-12-01
       
  • Analysis of high-purity bismuth oxide by atomic absorption spectrometry
           with reactive distillation of the matrix
    • Abstract: Abstract A procedure is developed for the analysis of bismuth oxide by electrothermal atomization atomic absorption spectrometry with matrix preseparation by reactive distillation as bismuth trichloride. The procedure allows the determination of Ag, Al, Co, Cu, Mn, Ni, Pb in bismuth oxide with limits of detection of 6 × 10−9 − 6 × 10−8 wt %.
      PubDate: 2014-12-01
       
  • Identification of volatile organic compounds by retention times and ion
           mobility spectra
    • Abstract: Abstract Retention times are determined and ion mobility spectra are recorded for reference substances belonging to the homologous series of saturated aldehydes, ketones, and alcohols with a nonbranched chain containing from two to nine carbon atoms. For aldehydes, ketones, and alcohols, the retention times grow exponentially with the number of carbon atoms in the analyte. The retention times decrease exponentially with increasing separation temperature. The dependences of the reduced mobilities of two peaks in the ionograms of aldehydes, ketones, and alcohols with drift in air at 330 K on the number of carbon atoms in the analyte molecules with a saturated nonbranched chain are obtained. In the range of molecular weights studied, normalized mobilities linearly decrease with increasing number of carbon atoms in the analyte, which is consistent with the published data. For substances with equal numbers of carbon atoms and a nonbranched chain, mobility decreases in the order ketone > aldehyde > alcohol.
      PubDate: 2014-12-01
       
  • Electrochemically modified semiconductor gallium arsenide electrodes for
           the argentometric titration of chlorides with silver nitrate in natural
           samples
    • Abstract: Abstract An electrochemical method is proposed for the modification of the surface of semiconductor gallium arsenide sensors. The electrochemical modification of the surface of GaAs-electrodes leads to the improvement of their electrochemical characteristics: an increase in the slope of the electrode function, a decrease in response time, and the extension of the concentration range. Potentiometric titration using unmodified and modified GaAs-electrodes for the determination of chlorides with silver nitrate in soil has been performed. The application of the modified sensors ensures the detection of the titration end-point with a higher accuracy.
      PubDate: 2014-11-01
       
  • Characteristic variations of gas-chromatographic retention indices for
           phases of variable composition
    • Abstract: Abstract On an example of mixtures of dinonyl phthalate and 2,2′-bis-(2-cyanoethoxy)diethyl ether, it was shown that the dependence of gas-chromatographic retention indices (RIs) on the composition (α) of mixed stationary phases can be both linear and with various abnormalities. These features of the dependence of RI-α can be explained by the existence of areas of homogeneity and disintegration of mixed phases. Another reason for the nonlinearity of the dependence RI-α is that the components of phases of variable composition are expressed in mole fractions, which is typical for polymethylphenylsiloxanes, widely used in contemporary gas chromatography. It is shown that the expression of composition in mass fractions enables the approximation of these dependencies in the homogeneity regions by linear regression equations with sufficient accuracy.
      PubDate: 2014-11-01
       
  • Extraction of chromium(VI) with blue tetrazolium chloride and
           tetranitrotetrazolium blue chloride
    • Abstract: Abstract The optimum conditions for extraction of microquantities of chromium(VI) as an ion-association complex with blue tetrazolium chloride (BTC) and tetranitrotetrazolium blue chloride (TNBT) has been determined. The extracted species was a 1: 2 of the BTC and TNBT cation and the chlorochromate anion. Beer’s law was obeyed in the range of 0.04–0.8 μg/mL Cr(VI) for BTC and 0.1–1.6 μg/mL Cr(VI) for TNBT. The molar absorptivities were ɛ255 = 7.77 × 104 L/(mol cm) (for BTC) and ɛ275 = 2.04 × 104 L/(mol cm) (for TNBT). Sandell’s sensitivity of the systems were found to be 6.69 × 10−4 μg/cm2 (for BTC) and 2.55 × 10−3 μg/cm2 (for TNBT). Limit of detection (LOD) is 8.55 ng/mL and limit of quantitation (LOQ) is 0.028 μg/mL Cr(VI) for BTC. For TNBT, LOD is 0.031 μg/mL and LOQ is 0.103 μg/mL. The characteristic values for the extraction equilibrium and the equilibrium in the aqueous phase have been determined. A sensitive method for determination of trace of chromium(VI) in plants has been developed.
      PubDate: 2014-11-01
       
  • About the limit of detection in X-ray fluorescence analysis
    • Abstract: Abstract Blank experiment in X-ray fluorescence analysis is actually a measurement of the background at the analytical line of an element to be determined. Numerous factors affecting the appearance and registration of the background signal are responsible for its normal distribution. In this work, the possibility of using real samples with low analyte concentrations as blank samples is substantiated. A criterion for the assessment of the correctness of different equations for calculating the limit of detection is proposed. An expression for the calculation of the limit of detection using a one-sided confidence interval of the distribution of analytical signal is derived. An algorithm for the assessment of the limit of detection is proposed.
      PubDate: 2014-11-01
       
  • Monitoring analytical measurements in presence of two component
           measurement error
    • Abstract: Abstract Control charts are increasingly adopted by laboratories for effective monitoring of analytical processes. Analytical methods are mostly subject to two types of measurement errors, i—additive and ii—multiplicative, or proportional, error. These errors have been combined in a single model, namely the two component error model (TCME) proposed by [1]. In this study we present a comparison among the performance of three widely used location control charts, i.e. Shewhart, CUSUM and EWMA charts in presence of TCME model. This study will help quality practitioners to choose an efficient chart for the monitoring of analytical measurements.
      PubDate: 2014-11-01
       
  • Erratum to: “Evolution of new narcotic substances and methods of
           their determination”
    • PubDate: 2014-11-01
       
  • Liquid membrane potentiometric sensor for determination of Fe 3+ ion
    • Abstract: Abstract Solution studies showed a selective interaction between the new synthesized ionophore, 2-[(thiophen-2-yl)methyleneamino]isoindoline-1,3-dione (TMID) and Fe(III) ion. Therefore, TMID was used as an iron selective ion-carrier in a plasticized liquid membrane sensor. The linear response range of the proposed electrode was 1.0 × 10−6–1.0 × 10−2 M. The Nernstian slope of 20.1 ± 0.3 mV/decade, and a detection limit of 5 × 10−7 M was obtained. The sensor could be used in the pH range of 2.3–4.8, and the response time was about 10 s. The lifetime of the electrode was at least 7 weeks. The sensor accuracy was investigated in two ways: (i) with the potentiometric titration of a Fe3+ solution with EDTA and (ii) with Fe(III) monitoring in some cationic mixtures. Finally, the newly fabricated electrode was effectively applied as an indicator electrode for the direct Fe3+ determination in real samples.
      PubDate: 2014-11-01
       
 
 
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